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<Title>Custom Scatter Labels</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Custom Scatter Labels</p>
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<img src="images/scatterlabels.png" width='450' height='400'>
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This example demonstrates adding custom labels to data points.<br><br>
<ul><li> The red glassy spheres in this example come from a scatter layer created using <a href="XYChart.addScatterLayer.htm">XYChart.addScatterLayer</a>.<br><br>
<li> The custom labels in this example is contained in an array variable, and is added as an extra field to the chart using <a href="Layer.addExtraField.htm">Layer.addExtraField</a>.<br><br>
<li> The data label format is set using <a href="Layer.setDataLabelFormat.htm">Layer.setDataLabelFormat</a> to show the extra field.<br><br>
<li> The font for the data labels is set to 8 points Arial Bold using <a href="Layer.setDataLabelStyle.htm">Layer.setDataLabelStyle</a>.<br><br>
<li> <a href="Layer.setDataLabelStyle.htm">Layer.setDataLabelStyle</a> returns a <a href="TextBox.htm">TextBox</a> object representing the prototype of the data labels. In this example, the <a href="TextBox.htm">TextBox</a> object is used to customize the background colors, 3D borders, position offsets and alignments of the data labels.</ul>
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/scatterlabels.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The XY points for the scatter chart
double[] dataX = {150, 400, 300, 1500, 800};
double[] dataY = {0.6, 8, 5.4, 2, 4};

// The labels for the points
String[] labels = {"Nano\n100", "SpeedTron\n200 Lite", "SpeedTron\n200", "Marathon\nExtra",
    "Marathon\n2000"};

// Create a XYChart object of size 450 x 400 pixels
XYChart c = new XYChart(450, 400);

// Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border (0xc0c0c0).
// Turn on both horizontal and vertical grid lines with light grey color (0xc0c0c0)
c.setPlotArea(55, 40, 350, 300, 0xffffff, -1, 0xc0c0c0, 0xc0c0c0, -1);

// Add a title to the chart using 18pt Times Bold Itatic font.
c.addTitle("Product Comparison Chart", "Times New Roman Bold Italic", 18);

// Add a title to the y axis using 12pt Arial Bold Italic font
c.yAxis().setTitle("Capacity (tons)", "Arial Bold Italic", 12);

// Add a title to the x axis using 12pt Arial Bold Italic font
c.xAxis().setTitle("Range (miles)", "Arial Bold Italic", 12);

// Set the axes line width to 3 pixels
c.xAxis().setWidth(3);
c.yAxis().setWidth(3);

// Add the data as a scatter chart layer, using a 15 pixel circle as the symbol
ScatterLayer layer = c.addScatterLayer(dataX, dataY, "", Chart.GlassSphereShape, 15, 0xff3333,
    0xff3333);

// Add labels to the chart as an extra field
layer.addExtraField(labels);

// Set the data label format to display the extra field
layer.setDataLabelFormat("{field0}");

// Use 8pt Arial Bold to display the labels
TextBox textbox = layer.setDataLabelStyle("Arial Bold", 8);

// Set the background to purple with a 1 pixel 3D border
textbox.setBackground(0xcc99ff, Chart.Transparent, 1);

// Put the text box 4 pixels to the right of the data point
textbox.setAlignment(Chart.Left);
textbox.setPos(4, 0);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap("", "", "title='Range = {x} miles, Capacity = {value} tons'"));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Custom Scatter Labels&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Custom Scatter Labels
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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<br><hr class="separator"><div class="copyright">&copy; 2022 Advanced Software Engineering Limited. All rights reserved.</div>
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